The ATLAS Detector at the Large Hadron Collider Peter Krieger IPP/University of Toronto
The ATLAS Detector at the Large Hadron Collider Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 2
Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 3 The ATLAS Canada Collaboration Alberta Carleton Montreal Simon Fraser Toronto TRIUMF UBC Victoria York this talk + calorimeter testbeams Focus on Liquid Argon Calorimetry Four NSERC funded projects: Hadronic Endcap Calorimeter Hadronic Forward Calorimeter Endcap Signal Cryogenic Feedthroughs Front-End Board Electronics 32 University/Lab Physicists 80 People, including engineers, technicians and students Educational Role 20 Undergraduate students 25 Graduate Students 16 Postdocs Other Important Activities Radiation Hardness Studies Physics Studies Event Filter Processor Farm ATLAS Computing Pixel Testing and Assembly
Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 4 ATLAS Canada NSERC-funded Construction Projects Hadronic Endcap Calorimeter Wheels Cryogenic feedthroughs Hadronic Forward Calorimeter Modules Liquid Argon Front-End Electronics
Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 5 The Large Hadron Collider at CERN proton-proton collider being installed in existing 27km circumference LEP ring at CERN in Geneva Switzerland pp centre-of-mass energy of 14 TeV constituent centre-of-mass energies ~ 1-2 TeV L = 10 33 cm -2 /s (low luminosity) 10 34 cm -2 /s (high luminosity) proton bunch spacing of 25 ns (40 MHz collision frequency) Physics Goals: whatever TeV scale physics is there to be discovered Higgs boson Supersymmetry Large extra dimensions Extended gauge theories Compositeness B Physics (oscillations, CP violation)
The Large Hadron Collider at CERN Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 6
The ATLAS Cavern Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 7
The ATLAS Cavern, 1 Year Ago Today Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 8
The ATLAS Cavern June 7, 2004 Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 9
The ATLAS Calorimeters Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 10
ATLAS Barrel Cryostat: Solenoid Insertion Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 11
Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 12 Endcap Signal Cryogenic Feedthroughs ATLAS liquid argon calorimetry has over 180k signal channels which must come through the walls of the cryostats Each feedthrough unit carries 1920 electrical channels. Barrel: 64 feedthrough units (+spares) Endcap: 50 feedthrough units total (+5 spares)
Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 13 Feedthrough Installation and Testing Complete Feedthrough construction in Victoria completed October 2002 Endcap C feedthrough installation completed January 2003 Endcap C cabling and electrical testing completed April 2003 Endcap A feedthrough installation completed Sept 2003 Endcap A warm cabling and electrical testing completed October 2003 Endcap A: all feedthroughs welded 26/09/03 Endcap A feedthrough electrical testing
Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 14 Liquid Argon FEB Electronics ATLAS Canada responsibilties: All Switched Capacitor Array Controllers All other deep sub-micron chips gain-selectors clock fanout
Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 15 Liquid Argon FEB Electronics SCA Controller SCA All chips have been delivered and await FEB construction: To start ~ July 2004
Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 16 HEC Module Production 32 modules / wheel Modules 160.00 140.00 120.00 100.00 80.00 60.00 40.00 20.00 HEC Module Production Finished at Institutes Cold tested Projected Finished Projected Cold Tested 0.00 Feb-00 Jun-00 Oct-00 Feb-01 Jun-01 Oct-01 Feb-02 Date Jun-02 Oct-02 Feb-03 Jun-03 Oct-03 Module Production Completed Coldtesting completed Fall 2003 HEC Wheel construction completed Construction of special modules for combined testbeam completed
HEC Wheel Assembly Procedure Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 17 Wheel assembly on Assembly Table Wheel rotation with Rotator Wheel Storage on T6/T6A Wheel Insertion into Endcap Cryostat
Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 18
Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 19
Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 20
HEC 1C and 2C Modules on T6A Tooling Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 21
Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 22 HEC Insertion Endcap C HEC wheel 1 insertion HEC wheel 2 insertion EMEC HEC1
Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 23
Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 24
Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 25 The Endcap Calorimeter System R [cm] 60 50 40 elm EndCap had EndCap (front) had EndCap (back) 30 20 10 0 Poly shield pumps FCal I FCal II FCal III (elm) (had) (had) Cu shielding 350 400 450 500 550 600 650 Z [cm]
Endcap C Forward Calorimeter Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 26
Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 27 FCal Insertion Into Endcap Cryostat cryostat cold cover
Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 28 Forward Calorimeter Construction Status FCal module construction completed May 2003 FCal calibration testbeam (using C end modules) Summer 2003 FCal C final assembly completed Fall 2003 FCal C integration into Endcap C cryostat scheduled for later this year FCal A module coldtesting completed January 2004 FCal A final assembly scheduled for later this year FCal Module0 refurbishing for endcap combined testbeam finished Fall 2003
Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 29 Module Alignment: FCalC Final Assembly FCal1 FCal2 FCal3
Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 30 FCalC Prior to Cable Dressing FCal support tube Brass Plug Shielding
FCalC Cold-cable Dressing Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 31
Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 32 FCalC Cold-cable dressing FCal1 FCal2 FCal3
FCal Cable Dressing Nears Completion Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 33
FCal Kapton Wrap / Ready for Insertion Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 34
Insertion into Cold Tube Begins Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 35
Insertion Almost Complete (3cm left) Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 36
Endcap C Forward Calorimeter Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 37
Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 38 Liquid Argon Calorimeter Testbeams Measure initial ATLAS calibration constants essential for good day 1 performance often superceded later (usually requires tracking information) no tracking in front of FCal, so testbeam calibration particularly important Calibration crack region (transition from EMEC/HEC to FCal: η 3.2 Important for understanding calorimeter intercalibrations (energy sharing) Important for dead-material corrections (tune MC using testbeam data) HEC/EMEC Combined Testbeam 2002 FCAL Calibration Testbeam 2003 HEC/EMEC/FCal Combined Testbeam 2004
Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 39 HEC/EMEC Combined Testbeam 2002 σ (E reco ) / E reco 0.5 Data π- 0.4 Data π + 0.3 Geant3 0.2 G4 LHEP G4 QGSP 0.1 0.07 0.06 0.05 0 50 100 150 200 E beam (GeV) HEC2 HEC1 EMEC NIM Draft exists
Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 40 FCal Calibration Testbeam Summer 2003 Placement:2.5 rotation, 100mm offset Cryostat Rotation: 0 0 1 2 3 4 Impact angle: 2.5 Impact angles adjusted to simulate beam from interaction point H1 cryostat in H6 beamline at CERN e, π, μ 10-200 GeV from CERN SPS
Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 41 Module Package Orientation for Calibration Testbeam FCal1 FCal2 FCal3 Evacuated beam pipe
FCal Package for Calibration Testbeam Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 42
Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 43 Forward Calorimeter Calibration Testbeam Not enough cable harnesses / electronics available for readout of all channels. 7 pigtails 5 pigtails 4 regular SBs 2 regular SBs 3 special SBs 3 special SBs 4 pigtails 4 regular SBs FCAL1 FCAL2 FCAL3
Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 44 FCal Calibration Testbeam Beam Impact Positions Beam hole Simulated cryostat bulkhead Energy Scan Data Points 5 GeV electrons 10 GeV electrons, pions 20 GeV electrons, pions 40 GeV electrons, pions 60 GeV electrons, pions 80 GeV electrons, pions 100 GeV electrons, pions 150 GeV electrons, pions 200 GeV electrons, pions, µ Beam spots for edge scan (only at 200 GeV) Beam spots for calibration (energy scan) FCal outer edge
Forward Calorimeter/electron event display Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 45 FCal1 : Single electron 200 GeV/c
Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 46 Energy Deposits in FCal1, 2, and 3 due to 200 GeV π s Accumulated over multiple π events FCal1 FCal2 FCal3
Energy reconstruction for electrons Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 47 Energy reconstruction for electrons: Sum over whole calorimeter (add noise from channels with no signal) Sum over channels within some radius of a seed channel 193.1 GeV
Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 48 FCal Electron Response 10, 20 and 40 GeV Beam particle selection criteria (here to eliminate pions) preliminary
Electron and pion linearity: Very Preliminary.. Electrons and Pions at Position 4L - Fit Electrons Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 49
Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 50 FCal Calibration Testbeam: Electron Energy Resolution σ/e (%) σ/e b = a E c E a=(3.76±0.06)%, b=(24.5±0.84) GeV %, c=(145.5±1.6) GeV% Analysis of pion results in progress E (GeV)
Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 51 Endcap Combined Testbeam HEC/EMEC/FCal R [cm] 60 50 40 elm EndCap had EndCap (front) had EndCap (back) η=3.2 30 20 10 0 Poly shield pumps FCal I FCal II FCal III (elm) (had) (had) Cu shielding 350 400 450 500 550 600 650 Z [cm] Intercalibration of endcap calorimeters Corrections for energy losses in dead material (tune simulation to testbeam results)
Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 52 HEC/EMEC FCAL Combined Testbeam EMEC+HEC+FCAL Setup Material studies Special HEC mini-modules EMEC Mod0 Cold tailcatcher FCal1/2 Mod0
Set-up for η=3.2 Beam Test Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 53 Lifting Tool for Complete Setup Lifting Tool for HEC1 or HEC2 EMEC FCAL FCAL Frame
Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 54
Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 55 Endcap Combined Testbeam Setup simulated FCal coldtube wall Front-End Crate Cold Tailcatcher feedthrough H1 cryostat FCal1, FCal2, EMEC Modules not visible
Peter Krieger IPP/Toronto CAP Congress, Winnipeg 2004 56 Summary ATLAS Canada construction projects nearing successful completion Hadronic Endcap Calorimeter Hadronic Forward Calorimeter Liquid Argon Cryogenic Signal Feedthroughs Liquid Argon Front-End Electronics Other efforts underway Event Filter ATLAS computing / Data challenges Radiation Studies ATLAS pixels Detector integration / installation is proceeding well Testbeam programs have been very successful NIM draft of 2002 testbeam (HEC/EMEC) exists Analysis of FCal calibration testbeam data analysis continues Combined testbeam currently underway and of course we all look forward to first data taking in 2007!